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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0b886dc4730129c74f9fd4f54b32fa38a03491086dabb5a781d20b88d3766e' 
  AND token = '9AHyr8iVFb0QI/1BIBrst28aSoy8M4aBDBav03rXe7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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