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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ee752fc62af7a6d5a928b18b76bb3a4ffecf469634f08f8a0e30af4b85bb58' 
  AND token = 'Yx1sllnfvTHfZaitzU+rrmUqUm9ChnHMyIcPBnkLvjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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