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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa77e3cb09a8cc68eebefaf3ea6ad2f8cf148b6106add976dc39562d5a6b3b8e' 
  AND token = 'qUZjNadOpmaaQF1W0CtjYMQ+6gyo8R/9xfNouHFBw8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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