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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bea1196621fa7dd13fa7ffbfcf3535d709cbd1e318529a5d1b59d41d7e8bf6e' 
  AND token = '8/aQPYzYkN85ZZTCYzjGLotJTsKaT5g0d5JBf8j9oTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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