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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ec8b938c634bab74a74d816a71f4450cc5ed2d4d03ebced991b86c69e23402' 
  AND token = 'qPCL041IDCKBNlc9n4ACbTtTcnTMTjRY53/80O9E4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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