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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefce76f95094a00669a1cd72d70849e09abe403d7af96f42e3e03b55ecb582b' 
  AND token = '6177O9kWoGbJxbVfAxc8hAfPob1r4Ile5tAmGS8Z4Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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