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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb0caedada9f8d375efcdcdd3dd98b888fa73c6d77f25fec63683626ac6fb5f' 
  AND token = 'lLZ+ePJn+EB+jTmZx19aLpiIOkWGd9zb2zCdfmiDtFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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