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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa45b1328256188b4b8229b579a23e39ab1ea6ca10dd2e84ae731b9ebed4641d' 
  AND token = 'RM4jBBZn5yZgy8u56IFIGKNuqlt4lzbQebqeuYYERk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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