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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b135bce25312ec0f2ce41fe2f5f2fdfa6662323d43b7d97a2feb7cb4301ec29' 
  AND token = 'qY7XGZtbEQHO1so4cBZC7k4DldaMyutdB/14e3t404w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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