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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6830303092b8b5527099487dd6bd7418137e6d2c4feb3eded8f23ad9b211e51' 
  AND token = 'WfFFBjYoLcl1xjdh3DfuuMvU8V5+7YV1kkgSPTff/yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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