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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138343c359365bcf170eff9e9138ffb90a269a5e7e7fe1e06e87b3d5cb94a9d6' 
  AND token = 'bsKRFw98EDekBZ2qeeQpietg2TniXH9Ga0dM4O5RQ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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