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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4ca38a7c2fddd097d0b528a5119e799ad880b698a991fcee31692d475c02b0' 
  AND token = 'Dx5lcru4kESP1K29I2nhkA1OcuDrjG3JzIvYjmp33U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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