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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24ed405e95ece5596011b9c7aa633dac24f962b95d3b7b23d06706ee0994e56' 
  AND token = 'oLn0BzwGx9bC06D3TXz/P2SJsVvmWPGbD1x9pXEYV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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