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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09042cbcf883dfece27abf89b0a82e7d6b81ea60787544030e4a1d2e82cce417' 
  AND token = 'IYqR6C0Jyyv5idL/VWQYDqeliUqWon1JmyF3MJmuEKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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