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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2a1c6fb19682fc4b971cc401a60cc96d6beb260f35b8c2c82c3304e65efecf' 
  AND token = '7gH2ugqYfoF22vQ8xbkov5IjOF8F67Zcy3QXbLes6sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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