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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03d127236f1058b57326fa5dd49c5899ddf0d0560ab65b610b6eff02722d003' 
  AND token = 'Tn8Lu1pOqiXEXrP95j6qVFvF+cPjlHb43Lmx9kf/jgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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