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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0aaab88ab2c9d147c85f9a0f7f340a84500f3d6a04b3337b40cfb12a8c0c20e' 
  AND token = 'xCoMe8/Qi/dznWSVEb1M+FsCWyCuoNIVZPElY8Iwp0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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