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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9ee64195aad243b5b3b0de6a15248492ae1c8e4eb888ada6a0067ec34e1e86' 
  AND token = '37dAvch5TczoLH/Lgm4d6SucU9u8jgAGB4na2VAxihA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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