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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a052f1f1771e599293353219c357c615e5d8414c730b3681cec72ba732986c1' 
  AND token = 'FEIRU3J0PP9xBaikTHHL6m0NWvXEpCdIcnwEBQANdz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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