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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61b815ce3022db4a58092c86980aed9491f418ffc8cc42afe7f77eb28f2d7e7' 
  AND token = '1yFmjV4KvyDnQDVKZfTwGdHfqcTcWEBzl6LmxUm5bOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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