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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b301267e12545b909f590b1c68f04d09a47251b9221e26de74bc84d231801e24' 
  AND token = 'MAuElpxlqg7roJhrTxLKVkkGctrROHurrlkXKBqzXBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}