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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c70d35b5ea5409bb88646e50a40c982344d2ceb4306295fb2b67c200dc2c98f' 
  AND token = 'NLS8/dqBAqBJ6Lu0DDAyCZqvttMFYkrw6MQwQEmgA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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