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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994ec4a56b11742310ffe0e4d7df262919ed826b6a6ec83d254746ff397e4235' 
  AND token = 'vwIRbZnmraqtKoildyr4nNTwuRt0Sj4XpIIm66F1Eto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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