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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffd32e371fa971fe9c8df2a2a0b8ab7115e1f7f5f81bac3c15e2fc8ac0c0823' 
  AND token = 'ms1UH5EwvkuGBErr6ATXTSqA5mUriLQ6Y/zcVWx4FYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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