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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7bd7759bccf3ed05d78c0df3b079e7981829897c0267bed6bfe7dff07d70c0' 
  AND token = 'eiByyhNWMSn5XDqlfUVq/Xy7isp2uiWYMNQLMtYghd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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