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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979b4eaea2948a66b69501cf0a274fd87bc4330f9fa48e03e4550afc2dc2694e' 
  AND token = 'tHbSdXGgai44NHq5Vnb8Iqw7WBUnoXok6/1damrbvC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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