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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e824cc9ddf8ef55521a93aed00ff7e57024a14a25dd692300322416b16e7df8' 
  AND token = 'xowLxE5BM83pd09slJGtNi/0Gl9VGh8e0Jk0C7sEJm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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