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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1179521ff3642acd78fefb7111e1e59b6da2e70e5b12820fa91d48c6e850af' 
  AND token = 'a2TjSWPcvfwWwfBhia14yiCJ5v4d6dleU75iiekG0/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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