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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b2d93a7a1ba08254e206c1cd260ae4bd49ad8236c9221f4a80f75105bec2a4' 
  AND token = 'JXx42LVmzy+ikd8NhKDeg8f6XkBBeELzTrX2zOJ8by0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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