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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5a5d062bf869c72860afe64cfe2596ac81ceed2da8fd16fd164e6f1ed8c76e' 
  AND token = 'ZmW5htfyAIGQr6pPldzS9cuox6Zz92T28hLcIZaWdyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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