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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4028e19ea9d62708dfaa4be4f82eaecc34ea33a4707ab6a2ee6483b3bd070d6' 
  AND token = 'Weqtx79ZBmcvc29KzCAK+hk5QpZPqgcXNrSJ0jwCjQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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