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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7d7fc8cc4897e481bd8c6c5b9719249b5b801a54ec0fee5c60af493c2364f4' 
  AND token = 'JayQDBFUlKLNdGRFu7M9NSMbrJHGo3vkF98e6Sx0sHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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