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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73e0dbac87ee271fbc89abe5ac9d50ed88f0bda4cf22921709beb77a827ce96' 
  AND token = 'N+32OscrvYS6c6aGC90TDHU3/xf+JJiJcD5wAqNoCF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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