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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5093f8267b5cced8166db877c24194074c0651f6348f25a757e56fa4d3098c1' 
  AND token = '3c/IN8dU5V0gpUHSdRG5VIZaBcrQQFGs9kQzwyf7QoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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