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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfde0d8f4cc384dc6da5a886bee791a5a14f22c0522e41c67d60a454d7936ab' 
  AND token = 'DtKsPHq07FM8tOIdF87OdTSN2jdQAhTihj4ZS/R9O3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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