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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4893fe90b01f953adb864501c1d04b710a50eaa4b31e31a8029c68a3cc1cf7c' 
  AND token = '4+KKjUueO9r8c/aXLvCYD6gIx5Ew23r43e6ZDwRCxv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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