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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d4ec82c3b27d4ac9633e084dff1f73f6a7ca27d1df5f70565babb9b974c84a' 
  AND token = 'bDr+a5ASgbEMzGsdnSY1P3lstkCI0eYbKDRdHyfCvEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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