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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaab9e86568cdc302446b6b1c80df6a6a246e362d8fd4c502285f7d9e2af5c7' 
  AND token = 'AmYFVzeLOZSxiEB1R4FCcgI5sI68PYlCzWQH1U9A2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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