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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30472a8f12b2d8d25a0e7ba6f01ec9aac80b266ffb72d7dc241c7942b384d19e' 
  AND token = 'yXdRXtiYUY456RXrIYYdrFSTgqZJVRxpuAiA8+TYNTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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