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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6541800e0bd7c9c7fb8a8b1f31de2ae2a8bdd746f6c5adf5b21807454cfcf06' 
  AND token = 'L4m52RLH/885YO/gycHqG7rxsY/+1XJgmk0bDSFVH/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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