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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8972eb508a6c0e0bf0197a586b5dee5ae08afbe2d7980af4caf7119d60cd82ec' 
  AND token = 'ICdyDoRnj/YjfoeG8862jZDPjjuuB3LY/a3fg4y1pEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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