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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdce90a71234066612c3f8e04fa20917bfc43a9319b6178e9a0f75f36e367145' 
  AND token = 'unJcDhewEzwojWR2O3MmY7yIKIl2uQBykqFapmTKSkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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