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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d0e7c1af17010b071f586fe4639c39db34a5512c93962ebdaa4081f7151a52' 
  AND token = '/Hb8tcGU1V/BcaAgEAM1jID8lP3wfusELztrY8oDV7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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