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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707dfd823588e4f47cc62052ca9dbe33f51ca4efa6b0b96069e8b8cdf916b689' 
  AND token = 'uC7jSFQNxmuEBkDE7XA6KCyg+otX9E64j5BMbujeokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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