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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d6a1717d7924f6880497943ea55f0a09796ad7520848b9dfe59b9dfb7f795e' 
  AND token = '9rnOc6ZhBCJbXlQeIi8mO/Ku6DD+Rp064ZhSY7/686s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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