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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8eb414f85899ffc58779381d8cc07e51d9757deaad9e860ee3044f6bafc0c0' 
  AND token = '67y304KkRSFVW9p9xNVOBIJg35fLrRxHqxbh1sJ5wG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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