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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c3357ea329feae447017d8e1f1d9e156320ccc7e96728d8d02a4da717434e4' 
  AND token = 'IBUGhBR4f7O4uP69wABolABLtvWLHiCzlZWG7UeWhwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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