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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f6c64eb7d156ade6ef8fd45b616fddc93f9b63dd5408049dc1fa0ef4a888c8' 
  AND token = '4IWAHWjKIfDaqtpPeqdelKVISozZzbgtUcmCrYUM8LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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