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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9185ca2805a27f917621112f7d5b0ba4dcb8578d6bf130ec8e257891f586a3dd' 
  AND token = 'j37a7U8kYZd7FnFQIIvf2T/XPolK3X1CwIu5fUx9w0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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