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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a45a3487419cceea9b4f447132e78944e751d93b9a92e8398893c4cf7496fe9' 
  AND token = 'SXy8oVpXbRBwblJfuOEEA8F2ALR2shTmUrPTYbm4Ovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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