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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151e0a468750d7e3df71a78cf94ac41623a08d66b3b84d088a2ba0c0df4ebc5c' 
  AND token = '8zZgxg9FE3tXsenQorYdEZoTIcPGQA6nUM+NDAvMCMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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