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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b95614da584d79bc23ad61179407fb0dc564a444a71907200ee7bac1c0eb5d' 
  AND token = 'bgqXAitBzu/qqQZ6azgYIGyGnhN8d2l7SE3L12Irnp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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