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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cac80ed7c55ab3a50524a6e00b7098adf302f198f3dac65d99c2a9c7ebbb2cb' 
  AND token = '806+ecVG3QimGFPUqgUJP309bKmY9l2pORE/NAfjrpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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