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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1caa8efac0e81fd0d6b9445a565baae029e1eb0d48edd3c80887ea987daff0' 
  AND token = 'AvPDchBT/Hb4le0B3Xk9WjgZKC9l9apbE/doH+VaBXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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