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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aae7fd32b6f0729ea93ea38e957d08e6ac43532886a67e2afc0dd6e3f0931d' 
  AND token = 'h9sx8T3Bs+NzekydfmnTDwXj1qj+YMwRmLUDdEyplxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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