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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0468bbe43fb5ccd9fa5dc28f476c90228ee564cc7138860e06cb6089f72fabdb' 
  AND token = 'ZR79elI5YYMZK3704rtdmnXAJ4zSzx8XuWr6EJMxJW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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