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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8aa04c8340e693e29befe8179c560528f5a178f693272c89d94ad1223184f6' 
  AND token = 'CkFC2usn4fF8kCDz3AKDgH3G+Xgig8kyMVQDWkL/ruA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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