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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca90eb0f356668e2184484d974efb2b27d325a88d9f3aca805dff8d9e4eebb97' 
  AND token = 'QUFDikcY56sl6EVg+TRT8wwwJhy47kaemzfEvT7FGM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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