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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fa7d4dfafd98af080015b6ecc72f5f29f026e1f5bf7c0f90c1baa27fefdaf1' 
  AND token = 'Em5HNr3QK+uqH/Aj0bq+p6HwSVQSK5EivfObKVItJuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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