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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2dc66d1965aa83ad8102cd329a21416c2ea24baa96c9df7862952a73ba2388' 
  AND token = '47Z0dnqiluWKcVqL3rPEf+Wj4YAauYUZxy0oCCEIEWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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