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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6903909912386c611904f6dc5fd436d541ba7f26dfba3124220e8daf38efd7' 
  AND token = 'Whmsncb6dnzJ0t95qApAXO4bgPbRY2rgzsE91HpNRpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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