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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060b0fa94b811c13863119f859d11584ca81a3031d2eca7264940639c5373c0a' 
  AND token = 'MSTEPO+yaSYCfrAcWZ2EYNmyK7bB4/oKsnNYTCFZrjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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