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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773aba825a4d6758034b309c4aeae7bdacaf8225bd68b5b6f02ec61e4ccaa2e5' 
  AND token = 'w3h68YIM2aBu2pE70fljf1ZebJ5ThKXBLWx7LFbyMTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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