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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d6d4002fcfda52e83ed9c2fc18045b3ccedc02ca2abecc80d9809e1dc4750d' 
  AND token = '+OZwGhzUPrQMdU4eznQJJAKIZMTJ/TztCilNoKHM8+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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