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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3614fe88a9ebad311157cb1ffb7aa72b21cd0eb9e8e5fce7c871944decd33b27' 
  AND token = 'coa0Lk02mc7JcdjnbHc7hUJUrpAVzbmQeoL2m+2HAGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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