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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb2de9b27f6172057408c0a0f42561307a8d9662042152deed43287d35f0ecf' 
  AND token = 'TlxUi1D+JF5nNsXWqs7ZfYJQ5rJA0NRKMNw4Kevu4eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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