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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db896407834a5ad74d6943b69d153954fa33f5c2563dd2e2a774b30910a03dfa' 
  AND token = 'd1VsBmQjHxtbKAKn1ycPcFUUm2exf7GWk0VZ5UzoZbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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