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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fb7712e39d9b176cd4ae6617a50263aa73729f87f6e98bed6c67fbc119ac24' 
  AND token = 'TBZwftpzVMr/ikF+DA4f6ljb9chDPsX2jfmQDsC3Rzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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