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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d715ce920be4ab0f6f62a7255042d2c6bfe2c71d9e6292f9c01553bf424892' 
  AND token = 'UKjhfp7+NeQJIsUTG9dSamnBJTuCzr6wnSB4t/ed14w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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