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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6785a8e6ce89c3a48fa342d1d22b6539352b250113e064a5b42034908a196030' 
  AND token = 'aZqUEPCL7NhT2v2qhd86MWygHmCjCD3FFIPGwanOUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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