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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b09f8c0f1817f95984b8982e578a6c3b4827f3c834e322c3919ee3903cf0f9d' 
  AND token = 'l1AbCmym7psbqXF2wEYs8rpdtGv3YK24Bwy+1odf568=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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