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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ae1b1db646385014b43ff4dae9a711e4f3e80350ca67e3bad6e92484b18b06' 
  AND token = 'h9bDl46dcl3eP87PwiKDAzDABC2w4e5+/LzlLHmMmqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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