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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754fe3e89fc93450f84e10afae9afc11d9af1dd4c3678fbd84e7a71ab2324e1e' 
  AND token = 'uBLRTrlNRqw5hqI0hF/EtNXl8E831B60eJWxeX4xK6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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