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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb720723156e95440f8a9899f1a143afcbc0660938697b5a06263820f5d69d6c' 
  AND token = 'Z3jFO6XrPurg8AcsU5P12+qijq1NF5O/uwlmEa+8v/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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