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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cae1e62a9ee40e7735a7bee03ad7125075b801ac47d2a68eeb1eab21eb2bec' 
  AND token = 'KxSxc4mscJP9+tw9n06GJzIhQ/tP71sc2vvnKwG7/LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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