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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882efdcf526e4b4157dd333e16a67f8b832d716443f2a9ddef75b86d58430b26' 
  AND token = 'mqBROnyL405Bco1se8lnATht5zKRd8MKElcSWQApJ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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