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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95bce16f28e1e4ba00b6b76e4ed90c993730db20987485640e00c7505e39978' 
  AND token = '8+RLTAjOP2vLcAACT/ecShgmO0F70X/ZdoD6KFIKeLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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