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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df39f074c0ad2f0bf2c393a4d763f5a4df33f5267bf88f136d6a0cbfb39ff0ed' 
  AND token = 'jDD0281j0WWgowtObpQG/Ohnzls6CAuft24OZHcMvkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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