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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fbba88019a75b4674ec309892102323ab38011a60f8fb40a5e443e950ac722' 
  AND token = '4VoqwIj3/1/fYfDBMcF5noPTJt4SBAiS32YHqfdZThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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