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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905586ef6897177cae416f2e6bfc9d841b6e7ab61f51eb6bab2048a4c264104f' 
  AND token = 'gSI+yAZPFnkGqPTdHU5GY/cnNZSBA4Vga6L/7OA+IvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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