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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ca2808d7fd4aff37584024791afe6c07078f68b30eb3cf29f4afe05e3b0908' 
  AND token = 'VLL3yuwMdSkv702fMkW5diOHErQXUOMDXRz0HXenPiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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