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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c25652ef1e513c6db9f1add82e3854e62010e19a70cbf6dd910fc9dead0a30' 
  AND token = 'oAInISQ4SBw1l4GIwzowSUk9ZSlGiUpoTNhL3MFXUuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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