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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36ed8a6a2f9972e7e53f74e375ac8d1e46191356db7bedeadf56ffb979c996d' 
  AND token = '4eIyea3wcXvp6mBVv4HLEczQGY5NjFLZMim/SZ4YaSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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