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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a85b3a48b6bd7b63421688771ffd0d984477abbe1c5bcdfb1b8e07d54d61cb4' 
  AND token = 'k9+/+YbmPErefqJANZCweLI1JD7i13FC96PdmtX+LPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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