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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4788219887bdd13c2d68eeee4b62241fdabe3df00df562381c395b4f16057695' 
  AND token = 'oks5R9yiD8hZ5VkMpuoK0Jft1ylNDEnb48LU+sXsTRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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